| 摘要 |
PROBLEM TO BE SOLVED: To quickly move a movable Yakumono (accessory) at the start of an advancing operation.SOLUTION: A gear mechanism 240 may enter an advanced side engagement state and a retracted side engagement state with a prescribed gap α. In the advanced side engagement state, a drive gear 701 comes in contact with a Yakumono (accessory) gear 703 from one direction when moving a first movable Yakumono (accessory) to an advanced position as shown in (a). In the retracted side engagement state, the drive gear 701 comes in contact with the Yakumono (accessory) gear 703 from a direction opposite the one direction when moving the first movable Yakumono (accessory) to a retracted position as shown in (b). A stopper makes the gear mechanism 240 stand by in the advanced side engagement state (a) at the retracted position of the first movable Yakumono (accessory). |
